Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a95312a2880088…

MALICIOUS

PDF

79.0 KB Created: 2021-02-15 05:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: c7235c8243d9e79b2c9023ab94dff2b2 SHA-1: 5b2c85fd617e26bc5c85131497b90aa3db9dd3f1 SHA-256: b5a95312a2880088c8d397fa9681eff27e4afe3dda69a68783442e6a383ab24c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a significant number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious payloads. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification yielded a high probability of maliciousness. The presence of numerous URLs hosted on disposable domains and link shorteners suggests an attempt to obfuscate the final destination and evade detection, likely leading to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://tehnoprom.org/46195706325n9f0k.pdf In PDF document text
    • https://cdn.sqhk.co/menaleratupo/hbje6u4/64713741979.pdfIn PDF document text
    • https://dowitunixobutoz.weebly.com/uploads/1/3/1/0/131070317/43f113083b8.pdfIn PDF document text
    • https://vatovuturok.weebly.com/uploads/1/3/1/8/131856009/gumapavu_ziwikon_wizubar_degenapul.pdfIn PDF document text
    • https://lekevemu.weebly.com/uploads/1/3/0/7/130776436/tuludotide.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxovowupofa/ijdLOgd/turinubirix.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/clow_card_fortune_bookfoa76.pdfIn PDF document text
    • http://lnstagramsupportlives.com/babotulopimetiwifolegafivvbhh.pdfIn PDF document text
    • https://moxizeza.weebly.com/uploads/1/3/3/9/133999163/jinejupepa_kamefasejibus_sexakoluto.pdfIn PDF document text
    • http://hangookoil.ru/sovazuvitamajinurack219.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/Xjghihd/tunnel_of_trees_michigan_peak_color_2020.pdfIn PDF document text
    • http://mabay.fun/revheadz_engine_sounds_apk_fulli1tpv.pdfIn PDF document text
    • https://kuxaxamolexude.weebly.com/uploads/1/3/4/8/134869233/kodabipajifejo-vofagiv.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/mokafidomifefedupiperun7y9v8.pdfIn PDF document text
    • https://diwowure.weebly.com/uploads/1/3/4/5/134592565/9740132.pdfIn PDF document text
    • https://pebiname.weebly.com/uploads/1/3/1/4/131453048/mexase.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/26185400802.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/iabNwij/ximuw.pdfIn PDF document text
    • https://druttle.ru/wix?keyword=rhodoks+best+unitPDF link annotation
    • https://cdn.sqhk.co/ribegibonot/gigShfT/82329819335.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000e48e.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000e48e.bin)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn extracted file (font_00_sfnt_off0000e48e.bin)
    • http://dejavu.sourceforge.netIn extracted file (font_02_sfnt_off00011925.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_02_sfnt_off00011925.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 4784 bytes
SHA-256: 601e4d3676a64fe8fbe9d9c437bdb4b0ac000778d1884a0a277032618642f38c
font_01_sfnt_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 10560 bytes
SHA-256: cc645069940bdb86704c7ade1d7d9183e1b535cc6458b7633ab24a88e212c4c4
font_02_sfnt_off00011925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11925 16232 bytes
SHA-256: 68eef4b610644b6a98f668349b58b424e8310755c20c018328a8321db0e17a89